the 45th Workshop on Photochemistry for Young Researchers_Chair and Awarded



Welcome party

Welcome party for new B3 students of Department of Chemistry at the cafeteria.
All the professors and B4/M1/M2 students were also joined.



BBQ w/ Kobayashi sensei, Tsukada Sensei, and their students

BBQ with Kobayashi and Tsukada groups. 
Nice opportunity to spend time with students and professors. 

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Our group develops stimuli-responsive molecular-based materials, such as crystals, liquid crystals, organogels and etc. We try to elucidate so far unknown responses of such materials and provide novel functionality of molecules.

Molecular-based materials exhibiting stimuli-responsivity

Molecular crystals or liquid crystals often show properties and functionality different from its individual molecule itself. This is caused by the neighboring molecules within the assembled materials which are connected through various intermolecular interactions. This indicates that the molecular-based materials can show properties/functionalities based on assembled states. Upon applying external stimulations to such materials, such as temperature change, photoirradiation and mechanical stimulations, the assembled states/molecular arrangements can change. As a result, these molecular-based materials exhibit various responses, i.e., property changes and mechanical movement.

Bridging the gap between macroscopic externals stimulation and microscopic molecular arrangement

We have reported that the molecular-based materials exhibiting emission color changes, electronic conductivity changes, and mechanical movements upon applying mechanical stimulation. These stimuli-responses are caused by the “macroscopic” mechanical force by means of a spatula or a pestle/mortar, which leading to changes in “macroscopic” molecular arrangements and patterns of intermolecular interactions. Our group tries to elucidate precise molecular arrangements within the crystals/liquid crystals to identify the effect of external stimulation, bridging the gap between macro- and microscopic information.

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84. Preparation of intrinsically fragile bent crystals,
T. Seki, S. Kobayashi, R. Ishikawa, K. Yano, T. Matsuo, S. Hayashi,
Chem. Sci., 2024, in press
DOI: 10.1039/d4sc02918f.
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83. (日本語) Mechanochromic aromatic hydrocarbons that bear one simple substituent,
T. Seki, K. Hattori,
RSC Adv., 2024, 14, 11, 7258–7262
DOI: 10.1039/d3ra08519h.
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Sorry, this entry is only available in Japanese.


82. (日本語) Functional Molecular Crystals from the Arylation of a Halogenoplatinum Complex: Stimuli-Responsiveness, Comproportionation, and π-Bridged Dimerization,
T. Seki, D. Korenaga,
Chem. Eur. J., 2023, 29, 62, e202302333
DOI: 10.1002/chem.202302333.
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Sorry, this entry is only available in Japanese.


81. Mechanical deformation and multiple thermal restoration of organic crystals: reversible multi-stage shape-changing effect with luminescence-color changes,
C. Feng, T. Seki, S. Sakamoto, T. Sasaki, S. Takamizawa, H. Ito,
Chem. Sci., 2022, 13, 9544–9551
DOI: 10.1039/D2SC03414J.
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Shape-memory materials can be mechanically deformed and subsequently reverse the deformation upon changing the temperature. Shape-memory materials have attracted considerable attention for basic research and industrial applications, and polymer and alloy shape-memory materials have been well studied; however, it is formidably challenging to develop functional shape-memory materials, such as materials with multi-stage and anisotropic shape changes and shape changes accompanied by changes in color and light emission. Here, we found a reversible multi-stage shape-changing effect after mechanical deformation in a molecular crystal induced by multi-step thermal phase transitions with reversible shape changes and luminescence-color changes. Using single-crystal structure and thermal analyses as well as mechanical property measurements, we found that the reversible multi-stage shape-changing effect was achieved by a combination of a twinning deformation and multi-step thermal phase transitions. The changes in the crystal shape and luminescence suggest novel strategies for imparting known shape-memory materials with additional functionalities.

+ Paper list